Pre-conditioning with the APU

TASK 12-33-21-618-001-A-02
Pre-conditioning with the APU

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

WARNING: MAKE SURE THAT DURING THIS PROCEDURE THE AIRCRAFT IS IN ONE OF THESE THREE CONDITIONS:

THE CABIN PRESSURE OUTFLOW VALVE IS OPEN.
THE FWD AVIONICS COMPARTMENT ACCESS DOOR 811 IS OPEN.
ONE OR MORE PASSENGER DOORS ARE OPEN.

YOU MUST ATTACH A WARNING NOTICE TO THE OPEN DOORS TO TELL PERSONS NOT TO CLOSE THEM. THIS PREVENTS ACCIDENTAL PRESSURIZATION OF THE AIRCRAFT.

CAUTION: DO NOT USE CONDITIONED AIR FROM THE APU OR HIGH-PRESSURE GROUND UNIT AT THE SAME TIME AS AIR FROM THE LOW-PRESSURE GROUND UNIT. IF YOU DO NOT OBEY THIS PRECAUTION, DAMAGE TO THE CHECK VALVES OR THE AIRCRAFT CAN OCCUR.

NOTE: The APU supplies air to the air conditioning packs 10HM/11HM.

1. Reason for the Job
For maintenance procedures
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT)
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
811

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
TASK 49-00-00-860-005-A	APU Start by External Power
TASK 49-00-00-860-005-A-01	APU Start by Batteries
TASK 49-00-00-860-006-A	APU Shutdown by External Power
TASK 49-00-00-860-006-A-01	APU Shutdown by Batteries
TASK 49-00-00-860-008-A	APU Start by External Power
TASK 49-00-00-860-008-A-01	APU Start by Batteries
TASK 49-00-00-860-009-A	APU Shutdown by External Power (131-9(A))
TASK 49-00-00-860-009-A-01	APU Shutdown by Batteries (131-9(A))
Air Condition Panel ** ON A/C NOT FOR ALL
Air Condition Panel ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 12-33-21-865-054-A

A. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AIR COND/FLOW/CTL &/IND1	1HB	D07
** ON A/C ALL
49VU	AIR COND/AVNCS VENT/CTL	6HQ	D06
49VU	AIR COND/AVNCS VENT/CTL	5HQ	D05
** ON A/C NOT FOR ALL
122VU	AIR COND/FLOW/MIXER/FLAP	3HB	V22
122VU	AIR COND/FLOW/CTL AND IND/2	2HB	V21
122VU	AIR COND/ZONE TEMP CTL/28VDC/SYS2	4HK	V20
122VU	AIR COND/ZONE TEMP CTL/28VDC/SYS1	3HK	V19
122VU	AIR COND/ZONE TEMP CTL/115VAC/SYS2	2HK	V18
122VU	AIR COND/ZONE TEMP CTL/115VAC/SYS1	1HK	V17
122VU	AIR COND/PACK TEMP/CTL SYS1/2/115VAC	21HH	W22
122VU	AIR COND/PACK TEMP/CTL SYS1/2/28VDC	23HH	W21
122VU	AIR COND/PACK TEMP/CTL SYS1/1/115VAC	1HH	X22
122VU	AIR COND/PACK TEMP/CTL SYS1/1/28VDC	3HH	X21
122VU	AIR COND/PACK TEMP CTL SYS2/2/28VDC	24HH	Y21
122VU	AIR COND/PACK TEMP CTL SYS2/2/115VAC	22HH	Y20
122VU	AIR COND/PACK TEMP CTL SYS2/1/28VDC	4HH	Y19
122VU	AIR COND/PACK TEMP CTL SYS2/1/115VAC	2HH	Y18
** ON A/C ALL
122VU	AIR COND/LAV/GALLEY VENT CTL/EXTRACT FAN/CTL	5HU	U21
122VU	AIR COND/LAV/GALLEY VENT CTL/EXTRACT FAN/SPLY	6HU	U19
122VU	AIR COND/RECIRC FAN/R/CTL	11HG	W20
122VU	AIR COND/RECIRC FAN/R/SPLY	3HG	W18
122VU	AIR COND/RECIRC FAN/L/CTL	2HG	X20
122VU	AIR COND/RECIRC FAN/L/SPLY	1HG	X18
122VU	AIR COND/AVNCS/VENT/MONG	3HQ	Y17
** ON A/C NOT FOR ALL
123VU	AVNCS VENT/EXTC/FAN	2HQ	AE02
** ON A/C ALL
123VU	AVNCS VENT/BLOWER/FAN	1HQ	AD10
** ON A/C NOT FOR ALL
123VU	AVNCS VENT/EXTC/FAN	2HQ	AC04

Subtask 12-33-21-860-052-A

B. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (Ref. AMM TASK 31-60-00-860-001).
(3) On the panel 30VU make sure that:

the PACK 1 and the PACK 2 pushbutton switches are in the off position (the OFF legends are on).
the COCKPIT, the FWD CABIN and the AFT CABIN temperature selectors are at the 12 o'clock position,
the HOT AIR pushbutton switch is in the off position (the OFF legend is on).

Subtask 12-33-21-941-054-A

C. Do at least one of the following safety precautions:
(1) Make sure that the cabin pressure Outflow Valve (OFV) is open.
(a) On the overhead panel, on the CABIN PRESS section of the control panel 25VU:

Put a warning notice in position to tell persons not to close the OFV.

(2) Or make sure that the FWD avionics compartment access door 811 is safe in open position.
(a) Put the ACCESS PLATFORM 2M (6 FT) in position below the FWD avionics compartment access door 811.
(b) Open the FWD avionics compartment access door 811.

(3) Or make sure that at least one cabin door is safe in open position.

Put a WARNING NOTICE(S) in position to tell persons not to close the cabin door.

4. Procedure
Subtask 12-33-21-618-055-A

A. Pre-conditioning with the APU
(1) Do the start procedure of the Auxiliary Power Unit (APU):

For GTCP 36-300 APU (Ref. AMM D/O 49-00-00-86) or
For APS 3200 APU (Ref. AMM TASK 49-00-00-860-005) or
For 131-9(A) APU (Ref. AMM TASK 49-00-00-860-008).

NOTE: After the APU starts, Airbus recommends you to wait for a minimum of 3 minutes (a warm-up period for the APU) before you select the APU BLEED pushbutton switch.

(2) On panel 30VU:

Push the APU BLEED pushbutton switch (the ON legend comes on)
Push the PACK 1 and the PACK 2 pushbutton switches (the OFF legends go off)
Push the HOT AIR pushbutton switch (the OFF legend goes off)
Push the X BLEED selector switch to the AUTO position.

(3) On panel 22VU:

Push the CAB FANS pushbutton switch (the OFF legend goes off).

(4) On the AIR BLEED page of the ECAM lower DU, make sure that the pack discharge temperature-indication is normal (green).

Subtask 12-33-21-618-058-A

B. When the pre-conditioning is no longer necessary:
(1) On the panel 30VU:

push the PACK 1 and the PACK 2 pushbutton switches to the off position (the OFF legends come on),
push the HOT AIR pushbutton switch to the off position (the OFF legend comes on),
push the APU BLEED pushbutton switch to the off position (the ON legend goes off).

(2) On panel 22VU:

push the CAB FANS pushbutton switch to the off position (the OFF legend comes on).

(3) Do the procedure to stop the APU:

5. Close-up
Subtask 12-33-21-860-053-A

A. Aircraft Maintenance Configuration
(1) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(2) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
(3) Close the FWD avionics compartment access door 811 if opened.
(4) Remove the WARNING NOTICE(S).
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.03.31 22:58:14 UTC